1e0ac8ab8f
Summary: My dear fellow Memgraphians. It's friday afternoon, and I am as ready to pop as WAL is to get reviewed... What's done: - Vertices and Edges have global IDs, stored in `VersionList`. Main storage is now a concurrent map ID->vlist_ptr. - WriteAheadLog class added. It's based around buffering WAL::Op objects (elementraly DB changes) and periodically serializing and flusing them to disk. - Snapshot recovery refactored, WAL recovery added. Snapshot format changed again to include necessary info. - Durability testing completely reworked. What's not done (and should be when we decide how): - Old WAL file purging. - Config refactor (naming and organization). Will do when we discuss what we want. - Changelog and new feature documentation (both depending on the point above). - Better error handling and recovery feedback. Currently it's all returning bools, which is not fine-grained enough (neither for errors nor partial successes, also EOF is reported as a failure at the moment). - Moving the implementation of WAL stuff to .cpp where possible. - Not sure if there are transactions being created outside of `GraphDbAccessor` and it's `BuildIndex`. Need to look into. - True write-ahead logic (flag controlled): not committing a DB transaction if the WAL has not flushed it's data. We can discuss the gain/effort ratio for this feature. Reviewers: buda, mislav.bradac, teon.banek, dgleich Reviewed By: dgleich Subscribers: mtomic, pullbot Differential Revision: https://phabricator.memgraph.io/D958
23 lines
447 B
C++
23 lines
447 B
C++
//
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// Copyright 2017 Memgraph
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// Created by Florijan Stamenkovic on 23.03.17.
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//
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#pragma once
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#include <list>
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#include "communication/result_stream_faker.hpp"
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#include "database/graph_db.hpp"
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namespace query {
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/**
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* Read Evaluate Print Loop, for interacting with a database (the database in
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* the given GraphDb). Immediately starts the user-input loop and interprets the
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* entered queries.
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*/
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void Repl(GraphDb &);
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} // namespace query
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